Just to chip in my 2c... You can go from the starting caps to sustaining on lettuce but you need to eat so darn much of it. I did find 50% &/or 75% rates to be more enjoyable. On the other hand, I then found everything from salad onwards to be OP, so I went back to 100%.
Will try the new balance but a couple of things for people struggling (I had a few restarts with this too) - bear in mind this might have changed now:
There is also the point of scale, which I think is fine but might be catching some people out... I used my starting caps to get 10 of each basic farm going (Tomato, lettuce & cucumber). I needed to eat from all 3 but I was in a net positive loop, so once I unlocked greenhouses, I was able to get those going pretty fast, again, 10 of each seems to be a good starting point (without doing the maths for salad ratio's or later foods).
One other tip: don't eat cucumber until you have it propagated through enough farms, the starting plants are all needed for seeds and eating a relatively small amount will waste too many seeds from the starting area (though you can get more later, further away from the start).